PP (Polypropylene) plastic raw material is a semi-crystalline thermoplastic. That is lightweight, chemical-resistant, easy to process, and is widely used in packaging, household goods, automotive, medical equipment, and other fields.
PP (Polypropylene) Main applications:
PP plastic raw materials are also widely used in daily necessities. Such as packaging, toys, washbasins, buckets, hangers, cups, bottles, and engineering applications such as bumpers.
Packaging materials:
PP plastic raw materials are often used to make various packaging materials, such as food packaging boxes, plastic bags, bottle caps, bottles, etc. In addition, it is also used for cosmetic packaging bottles, lotion bottles, health care product bottles, and medicine bottles.
Auto parts:
PP plastic raw materials are widely used in automobile manufacturing, used to make body parts, dashboards, bumpers, etc. Modified PP materials are also widely used in flame retardant, reinforcement, and toughening of automotive electrical appliances.
Pipes:
In addition, PP pipes are mainly used in building hot and cold water and drinking water pipeline systems, heating systems, air conditioning systems, and telecommunications and electrical piping.
Medical equipment:
PP plastic raw materials are used to produce disposable sterile syringes and other medical devices.
Turnover boxes and pallets:
PP plastic raw materials are used to make large packaging and transportation supplies such as parts turnover boxes, food turnover boxes, beverage turnover boxes, and garbage bins.
Home appliances and toys:
PP injection molding plastic raw materials are mainly used in small home appliances, toys, washing machines, and children’s tableware.
Engineering plastics:
PP plastic raw materials can be used as TV and radio housings, electrical insulation materials anti-corrosion pipes, etc.
Environmental protection equipment:
PP sheets are often used in acid and alkali-resistant equipment, electroplating equipment, solar photovoltaic equipment, wastewater and waste gas emission equipment, etc.
PP Injection molding machine
In fact, the working principle of the PP injection molding machine is similar to the basic working principle of other plastic injection molding machines, which is to heat the molten plastic material and inject it into the mold, after cooling and curing to form the desired plastic product.PP injection molding machine is mainly used to process polypropylene (PP) plastics and has parameter settings suitable for the characteristics of PP materials. Below are the details of how PP injection molding machines work:
Plastic heating and plasticizing
The PP plastic raw materials (usually in the form of pellets) pass through the hopper into the charging section of the injection molding machine. In this section, the screw rotates and transports the raw material forward to the heating zone.
The heater of the barrel of the injection molding machine starts heating and the temperature is usually controlled between 160°C and 250°C (depending on the characteristics of the PP material and the product requirements). The PP plastic raw material gradually melts under the action of the heater and becomes a molten state with good fluidity.
The screw not only plays the role of conveying the plastic raw materials but also further melts the PP material evenly through its own rotational friction. So that it has a good plasticizing effect.
Injection Process
- At first, when enough molten PP material gathers in front of the screw, the screw stops rotating and moves forward. This is achieved by pushing the screw in a straight line by a hydraulic or servo motor.
- The forward pressure of the screw injects the molten PP material into the mold cavity through the nozzle. This process is called “injection”. The injection speed and injection pressure are precisely controlled according to the product demand to ensure that the plastic fills the mold and avoids material shortages or air bubbles.
- After the injection is complete, the screw continues to maintain pressure, known as the packing phase, to ensure that the material is replenished during the cooling and curing of the plastic, preventing shrinkage and denting of the product.
Cooling and curing
- After the PP material is injected into the mold, the mold begins to cool. Cooling is done through the mold’s cooling water system, which usually uses cooling water to remove heat from the mold.
- During the cooling process, the molten PP material gradually solidifies to form the final part shape. The length of the cooling time depends on the thickness of the part, the mold design, and the thermal conductivity of the PP material.
Mold opening and product removal
- When the PP material in the mold is completely cured, the injection molding machine control system will open the mold. When the mold is opened, the moving mold and the fixed mold are separated, exposing the cooled plastic products.
- At this time, the manipulator or ejection mechanism of the injection molding machine ejects or takes out the product from the mold. At last, after the product is removed, the mold is closed and ready for the next injection cycle.
About Haichen PP injection molding machine
Haichen machinery produces highly precise injection molding machines with a clamping force ranging from 50T to 3000 T. The products have a highly rigid structure and are equipped with imported hydraulic and electrical elements.
High efficiency:
At the same time, Haichen PP injection molding machine has a fast molding cycle. It can produce products in large quantities, improves production efficiency, and is suitable for high-volume manufacturing needs.
Energy saving and environmental protection:
Haichen PP injection molding machines usually use energy-saving motors and advanced control systems. It can effectively reduce energy consumption, and PP materials can be recycled and reused, which meets environmental protection requirements.
High-precision molding:
Through precise temperature, pressure, and injection speed control, the injection molding machine can manufacture PP products with stable dimensions and good surface quality, which can meet the needs of industries with high precision requirements.
Simple operation:
Haichen PP injection molding machine is equipped with the automatic control system, the operation interface is friendly. It is easy for operators to learn and master. And it greatly reduces the manual operation cost and error rate in production.
PP injection molding machine has the advantages of high efficiency, energy saving, environmental protection, and precise molding, and is widely used in a variety of industrial fields.
Ningbo Haichen Machinery was founded in 2005 in Ningbo, Zhejiang, China. We have a number of R&D personnel and cooperate with a group of high-tech enterprises.
It mainly produces highly precise injection molding machines with a clamping force ranging from 50t to 3000t. In addition, the products have a highly rigid structure and are equipped with imported hydraulic and electrical elements, It also uses mixing metal screw heads in order to have excellent plastifying performance and it’s suitable for plastic injection molding products.
Therefore, if you need more information, welcome to contact us.
